For most of us, our first encounter with the concept of a diffuse sound field is when we are introduced to the theory behind the Sabine equation. However emboldened by the ability to predict reverberation time (RT), we probably imagine that the diffuse requirement can be mostly ignored. Then once we start using a computer simulation models, we discover that many predicted RTs differ from the Sabine values. The reasons for this are generally a poor state of diffusion; in fact most spaces in real life are not particularly diffuse! This paper will discuss the nature of diffusion, the requirements for diffusion, and the situation in concert halls, both subjective and objective. Overall, there is the question of whether a diffuse sound field is a suitable goal for concert hall design.
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